What's the difference between that auction and this one? http://www.ebay.com/itm/1981-Topps-240-Nolan-Ryan-Houston-Astros-/141947843982?hash=item210cc0358e:g:nS0AAOSwZ8ZXAGbV
That's what I don't get about cards. One auction will go for $1000 and another (that looks the same to me) goes for $2.
I found boxes of mine recently. Donated a ton of them but kept the "good" ones. (Good ones in quotes, because I was a big Delino Deshields and Robert Horry fan)
Cards can be graded for perfection. Ungraded cards will go for next to nothing while a certified gem mint card will go for many times more...